We derive a general analytic expression for the coupling efficiency when a partially coherent, partially polarized beam is coupled into a multimode optical fiber. We adopt the Gaussian–Schell model for incident electromagnetic beams and use our general result to discuss the effects of the partial coherence and partial polarization on the coupling efficiency of an optical beam focused onto a step-index, single-mode fiber with a lens. Our results should be useful for any application requiring coupling of partially coherent beams into optical fibers.
© 2009 Optical Society of America
Coherence and Statistical Optics
Original Manuscript: May 26, 2009
Revised Manuscript: July 27, 2009
Manuscript Accepted: August 6, 2009
Published: September 11, 2009
Mohamed Salem and Govind P. Agrawal, "Coupling of stochastic electromagnetic beams into optical fibers," Opt. Lett. 34, 2829-2831 (2009)